Optical recording medium for retail activation

a technology of optical recording media and retail activation, which is applied in the field of optical recording media, can solve the problems of not being able to use this solution for read-only optical recording media, and the optical recording media on display in the shop should not play properly, so as to achieve the effect of increasing security

Inactive Publication Date: 2010-06-24
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is an object of the invention to propose an optical recording medi...

Problems solved by technology

Optical recording media that are on display in a shop should not play properly unless they are properly bought, paid for, and then activated at the point of sales.
However, it is not possible to use this solution for read-only ...

Method used

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  • Optical recording medium for retail activation
  • Optical recording medium for retail activation
  • Optical recording medium for retail activation

Examples

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first embodiment

[0048]FIG. 1, FIG. 2 and FIG. 3 show an example of the sequence of sputtering, initialization and activation, respectively, of an optical recording medium 20 according to the invention. The light sensitive layer stack shows a low-to-high behavior and is chosen such that in the saturated state the reflectivity essentially equals the reflectivity required by the specification of the corresponding read-only optical recording medium.

[0049]After the sputtering the reflectivity of the optical recording medium 20 is below the required reflectivity over the whole surface area of the optical recording medium 20, as depicted in FIG. 1.

[0050]During initialization some areas 21 of the optical recording medium 20 are covered by a mask. These areas 21 keep their lower reflectivity even after initialization. Those areas 22 that are not covered by the mask during the initialization have a higher reflectivity after initialization. As shown in FIG. 2, the surface of the optical recording medium 20 ha...

second embodiment

[0054]Two different ways for implementing the second embodiment shall be discussed in more detail.

[0055]One possibility is to provide some areas of the optical recording medium 20 with a light sensitive layer stack with a high-to-low behavior, while other areas are provided with a light sensitive layer stack with a low-to-high behavior. This is preferably achieved by using a special mask during sputtering. The resulting diagram of the reflectivity levels is depicted in FIG. 5. During initialization and activation the high-to-low areas are covered by a mask, as an illumination with the initialization or activation power would decrease their reflectivity. This would make the optical recording medium 20 irreversibly unplayable. During activation the reflectivity of the low-to-high areas is increased up to the saturation level, which is essentially equal to the higher reflectivity level of the high-to-low areas. Consequently, after activation the whole optical recording medium 20 has es...

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PUM

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Abstract

An optical recording medium to be used for a retail activation solution is proposed. The optical recording medium is a modified ROM disk that can only be played after the application of an activation process. For this purpose at least a part of a reflective layer of a read-only area of the optical recording medium is replaced by a light sensitive layer stack that changes its reflectivity upon illumination.
Also proposed are a method for producing such an optical recording medium as well as methods and apparatuses for initializing and/or activating such an optical recording medium.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an optical recording medium to be used for a retail activation solution. The optical recording medium is a modified ROM disk that can only be played after the application of an activation process. The invention further relates to a method for producing such an optical recording medium as well as methods and apparatuses for initializing and / or activating such an optical recording medium.BACKGROUND OF THE INVENTION[0002]There is an increasing interest for a method of so called retail activation. Optical recording media that are on display in a shop should not play properly unless they are properly bought, paid for, and then activated at the point of sales. The need for activation the optical recording media serves as a theft protection.[0003]For example, it has been proposed to leave out some necessary data on the optical recording medium, without which the optical recording medium cannot play properly. These data are then r...

Claims

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Application Information

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IPC IPC(8): G11B3/74G11B7/00G11B7/24G11B7/24062G11B7/243G11B7/2433
CPCG11B7/2433G11B7/24062
Inventor KNAPPMANN, STEFANKRAUSE, MICHAELKHRUSHCHEV, SERGEY
Owner THOMSON LICENSING SA
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